<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>星空背景连线</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        #canvas{
            display: block;
            background-color: #000;
        }

    </style>
</head>
<body>
<canvas id="canvas"></canvas>
<script src="demo.js"></script>
</body>
</html>
